I rented a D800, and ended up buying a D600... did a photo shoot with both. I was using Camera RAW 7.0 on CS6, and of course none of the files wouldn't open. I ran the update to Camera RAW 8.6.
Now the D800 files open, but the D600 files still won't open... complaining about the version. Anyone else have this issue? Help!
You should have no problem with the D600, as it was supported from ACR 7.3. My guess is that you used old Nikon software to download the images from the D600, and this has altered the images so that they can't be read by Adobe's software.
You should use the Nikon downloader in their latest versions of ViewNX or CaptureNX (which fixes the corruption problem with newer cameras), or Adobe's own "Photodownloader".
If this is the case, you might want to try this utility with your problem D600 images: